Automatic exposure attachment.



H. M. JOHNSON.

AUTOMATIC EXPOSURE ATTACHMENT.

APPLIOATLON FILED SEPT. 19, 1912,

1,060,259., Patented Apr. 29, 1913.

3 SHEETSSHEET l H. M. JOHNSON. AUTOMATIC EXPOSURE ATTACHMENT.

APPLICATION FILED SBYT 19.1912.

Patented Apr. 29, 1913.

3 SHEETS-SHEET 2.

3 u ucu toz ET; M. John son.

H. M. JOHNSON.

AUTOMATIC EXPOSURE ATTACHMENT.

APPLICATION FILED SEPT. 19 1912.

Patented Apr. 29, 1918.

3 SHEETSSHEET 8.

I view of'the device. spective view of the 'taken on the line 9-9 4tive'view of .50

, ject .struction and combination of parts hereinelevation of tion withthe parts removed to expose the clock working mechanism. Fig. 3 is aside zontal sectional view" taken on the line like characters ofreference designate simi- UNITED s'rafras PATENT OFFER.

HARRY M. JOHNSON,

Application filed September the United States, residing at Fresno, inthe county of Fresno, State of California, have invented certain new anduseful Improvements in Automatic Exposure Attachmeritsyand I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

T his invention relate. to automatic camera shutter operators, and hasfor an obto provide a novel bulb holder that will ress the bulb at apredetermined time,

comp

to take his own thus enabling the operator picture, A further object ofthe invention is to provide novel means for actuating the holder.

\Vith the above objects in view, the invention consists of certain noveldetails of conafter fully described and claimed, it being understoodthat various modifications may be made in' the minor details ofconstruction within the scope of the appended claims. i

In the accompanying drawings forming part of this specification, Figure1 is a side the device applied Fig. 2 is a side elevation of the devicein normal posiof-the device in operative position with partsbroken-away. Fig. 4 is a 'front' elevationof the device. Fig. 5 is aplan Fig.- 6 is a detail perelevation AUTOMATIC nxrosunr.A'r'rAcin/iiiiv'r,

bulb holder. Fig. 7 is a horizontal sectional view taken on the line7-7.Fig. 2. Fig. 8 is a. horizontal sectional view taken on the line8'-8 Fig. 2. Fig. 9 is a fragmentary vertical sectional view Fig. 7.Fig. 10 is a fragmentary vertical sectional view taken on the line 1010Fig.2. Fig. 11 is a hori- 11-41 Fig. 3; Fig. 12 is a detail perspectheattaching bracket.

the drawings in Referring now to which box into which;

lar parts, 10 designates a i be inserted, the i my invention is designedto box :bein table 11 y. a bracket such as is shown in 1 preferablysecured tothe tripod OF FRESNQ' CALIFORNIA.

' Specification of Letters Patent. 7 P a ten tef l Apr, 191 3,

Serial No. 721,238.

Fig. 12, the bracket including a U-shaped member 12 which is adapted tostraddle the edge of the table 11, and an arm 13 which is pivotallyattached to the member 12, as shown at 1-1 and is'normally held inhorizontal position by a leaf spring 15, the arm being bifurcated toshown at 16, and .there being a hinge leaf 17 applied to the bottom legof the U-shaped member and operated by a set screw 18 to bind against 1,to secure the bracketthereto.

The device for momentarily squeezing the bulb 19 to actuate the shutterlever 2-0., is shown to comprise a casing 20 of sufiicient size tosnugly fit within the box'10 and hav ing a pair of fixed parallel ears21 rising from the top, these cars being adapted to project abovethebox, as shown in Fig. l. A standard 22- is fixed to each frontuppercorner of the casing, as shown in Fig. 6, and

between these standards a pair 0 superposed divergent bulb squeezingplates 23 and 24: are arranged, a pintle'25 being passed through thestandards andthrough inter-fitting hinge lugs 26 and '27 on the platesto pivotally secure the plates together at their meeting. The free endsof project between the fixed the bulb squeezing plates cars 21 of thecas face near the upper gravity catch 28,, the long leg 28 of which isprovided with a stop "finger 29 thatbears upon thetop' edge of the plateand normally holds the catch in such a )osition that upon the'bulb'beinginserted etween the plates the free end of th upper plate will contactwith theshort'leg 28"- of the catch, as shown in Figs. 5 and 6. Thelower'bulb squeezing plate% is of greater length than the upper bulbsqueezing plate 23 so that when the former is urged upwardly, as willpresently be described, its free end contacts with the long leg 28 ofeach catch and rocks the catches upwardly with a resultant disengagementof the short legs 28" .of the catches from 'the upper bulb s ueezingplate, as shown in Fig. 3. The hub is squeezed during the travel of thelower plate toward the u per plate, and at the instant the latter isreed "by the catches, the bulb ex ands, the upper plate being carriedupwar 1y by and ofierto such expansion of the ing no resistance receivethe box, as

-ing, and each ear isprovided on the inner edge with an angular.

rod30 is pivotallyconnected at the upper end tothe plate by means of apivot pin 31 passed transversely through theupper end 50f the rod andhearing within strap brackets 32 secured to the bottom face ofthe plate.on opposite sides of the rod, as shown in.

.. Fi-gs.'3 and 4. j A vertically swinging lever 33 is secured at'oneend to the inner face of-one of the side walls f the casing by means ofa pivot pin 34 and is pivotally fsp ring 36 is seated on the connectedto the lower end of the stand red by means of a pivot pin 35.

stand rod'between a collar 37 fixed to the rod anda stationary stopbracket 38 fixed to the casing.

The spring is-exp'an'ded duringmanual. de-

presslon of the lower plate to insert the bulb, as shown in Fig. 2, andis held in this position by a .contaet with the stand rod by "1'circular time controlled locking mechanism which .Wlll be. presentlydescribed. Upon release of this mechanism, the sprin For' locking thestand red at its lower limit of movement, a horizontally swinginglocking bar 39, best shown in Figs. 8 and 11, is pivoted at one end totheinner face ofthe casing top, and is normally held in means of a leafs ring 40. A projection 41'formed integrafwith the'stand rod near thetop of the latter engages underneath of this bar when the stand rod isdepressed, as shown in Figs. 2 and 8, and in this position of the partsthe stand rod is locked against returning to initial position until thelooking bar is moved from engagement with the projection the timecontrolled mechamsm.

For releasing the locking bar, the free end of the latter ispivotallyeonnecte'd to a ull rod 42 which is slidably' fitted inbrackets 43 secured to the inner face of the casing top and is centrallyequipped with a dependingf'hook 44. A revoluble gear 45 is fixed to ashaft 46 and is formed with a series of openings 47 arrangedcbnoentrically with the shaft, these open ing's be ng adapted to receivea pin 48 car- "the hook and pull the Th seen ried by'a' leaf spring 49which is loosely mounted on the shaft 46. A side opening 50 formed inthe casing exposes the ,gear 45. Referring to Figs. 2 and 3, it willthat the hook 44 1s arrangedin the athvof movement of the pin 48, anddurng rotation of the-gearthe pin will engage pull. rod 42 Out ofengagement with thepr o ection of the stand rod-30; with re ultant,release of the stand 1 d -I. "Thmpull rod limited n its movement Ahelical a contracts and urges upwardly the stand ro and lower plate, asshown in Fig. 3.

due to the action f the pin by means of a stop lug 51 which projectsthrough a slot 52 in the casing-top, this'lug engaging the end wall ofthe slot as shown inFi'g. 3and performing the dual function of limitinmovement of the pull rod and'holding I e gear 45 against furtherrotation. To time the release of the stand rod, the pin 48 may be movedfrom the. position shown in Flg. 3- back to the position shown in Fig.2, or into that particular opening of the series 47 which will permit ofa predetermined lapseof time before the pin is carried by rotation .ofthe gear into engagement with the hook.

Any desired. means may be employed for actuating the gear, 45, but inthe present embodiment of the invention, a clock work mechanism isillustrated, and will be briefly described. By referring to Figs. 7, 9and '10, itwill be seen that a gear 53 is provided on one side with asleeve 54 whichis loosely mounted on a'shaft 55 and is provided on theopposite side with a recess which receives a coil spring 56 that isconnected at one end to the shaftand at the opposite endto the gear.This gear is only for the purpose of winding ,up the spring, and mesheswith a gear 57 which may be retated in one direction by a winding key 58and is held against rotationiin the opposite direction by a spring 59,thus holding the gear 53 stationary after the latter has been actuatedto wind the spring. The shaft 55 is equipped with a gear 60 whichactuates the above described pin carrying gear 45 during rotation of theshaft 55 under the unwinding action of .the spring 56. The

shaft 55 is'further equipped with a gear 61 which meshes with a pinion62 that drives a retarding train of gearing 63, which in turn iscontrolled by an escapement .64.

The operation of the device is as follows: The operator depresses thelower' bulb squeezing plate 24 and inserts the bulb as shown in Fig. 2.The pin 48 is then engaged in that particular opening of the gear 45which will permit of a predetermined lapse of time before the pin isrotated by the gear into engagement with the pull rod hook 44. Thewinding key is then actuated to wind the coil spring 56 and when,released the spring immediately sets in motion the clock work mechanismabove described with a resultant rotation ofthe gear 45. The operatormay then take position in front of the camera and when the predeterminedtime has elapsed the pin will have moved into the position shown in Fig.3 with a resultant momentary 'squeezin of the bulb and actuation ofthe'camerars utter.

What'is claimed is 1..A bulb compressing device includingrelatively-movable bulb compressing members, a c'atch'for holding one ofsaid mem- I bers stationary, and means for moving the other of. saidmembers toward the first named member to compress the bulb,the lastnamed member being adapted to engage and release said catch whereby tofreethe first named member and permit of expansion of the bulb. 7 p 2. Abulb compressing device including bulb compressing members hingedlyconnected together and adapted to embrace a bulb, a pivoted catch fornormally jliolding one of said members stationary and means for movingthe other member toward the stationary held member to compress' flhebulb, said movable member at the comp etion of its compressionmovement-tilting said catch to release the stationary held mei'nber andpermit of expansion of the bulb.

.members toward the other member, and a catch on said support engagingand holding the last named member stationary, said movable member beingadapted during its movement to engage and release said catch withresultant release of said stationary member.

In testimony whereof, I afiix my signature, in presence 0f twoWitnesses.

HARRY M. JOHN SON.

\Vitnesses:

ADoLPH J. H. Scrivener, CLARENCE H. NIELSEN.

